The devil is in the details. Too many guys don't know how much to torque a barrel nut or how it being slightly mis-aligned can cause the gas tube to rub the gas key. Folks are always installing FCG springs incorrectly. Some don't know what to do when the safety doesn't match the FCG. Some guys think a canted FSB is from over torquing the barrel nut. There are still experts who think the gaps in the piston rings need to be staggered. Believe me, there is more to consistently assembling ARs correctly than just spinning on a new filter, topping off the oil and inflating the tires to 35 psi



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